Converso is the Spanish-language word for people who converted from Judaism to Christianity during the Inquisition in Spain and Portugal. Many conversos, or anusim in Hebrew, fled to Latin America.

Overall, converso genes account for only a small part of the ancestries of the study populations from each country, ranging from 1 percent in Brazil to 4 percent in Chile. The researchers used a set of DNA variations, or haplotypes, observed to be common among Jews with roots in the Iberian Peninsula.

But converso genes “are widespread,” Chacón-Duque told JTA.

Some 23 percent of the 6,589 people sampled showed some genes — or more than 5 percent of their ancestry — associated with Sephardic, East Mediterranean or South Mediterranean ancestry, “probably stemming mostly from the clandestine colonial migration” of conversos, the researchers wrote.

“For every individual we characterized more than 600,000 genetic variants,” they added, “creating a dense genome-wide profile of genetic variation for each individual.”

The study is the most comprehensive of its kind in Latin America, but “it doesn’t represent the whole population” of the genetically diverse region and “has biases,” Chacón-Duque said.

While the study indicates that converso genes have spread far and wide in Latin America, he added, the research sample of fewer than 7,000 people “doesn’t necessarily mean that a quarter of Latin Americans have Sephardic genes.”